Sash-center.



C. V. HETTS.

sAsH CENTER. APPLICATIQN FILED JAN. I3, 1919.

Patented Apr. 1, 1919.

v vvuem/coz 1./ 527725,

dumme? ionrrEn STATES PATENT oEErcE CHARLES v. HETrs, or DETROIT, MIciiieAiiT.

To all whom t may` concern:

Be` it "known that I, CHARLES V. I-IETTS, a`

citizen of the United States, residing at .De-w

troit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Sash-Centers, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the` same, reference being had to the accompanying drawings, whlch form a part of this specification.-

My invention relates to sash centers and it consists in certain improvements hereinafter described and claimed.

In the drawings: Figure 1 is a perspective view of the sash center in place upon the sash andthe j amb with the construction partly outlined in dotted lines.

Fig. 2 and Fig. 3 represent the two halves of the sash center.

Fig. 4 represents the block therein which carries the friction rollers.

Fig. 5 and Fig. 6 represent the fastenings Iof the back of the sash center and are details of Fig. 7.

Fig. 7 is a cross section on the line Y-Y of Fig. 8.

Fig. 8 is a plan view of the jamb side of the sash and a reverse view of Fig. 3.

Fig. 9 is a view ofone of the rollers.

Fig. 10 is a cross section on the line X-X of Fig. 7.

Similar letters refer to similar parts.

In the drawings A represents one of the sections of the center which is mortised into and attached to the jamb. B is the other plate and section which is mortised into and attached to the sash. Obviously, however, these could be reversed in case it is desired to do so. C is ablockwhich has a center or swivel part at C. The rear side of this block is shown in Fig. 8. The face side, that is the side outwardly toward the block B when assembled, is shown in Fig. 3 at C2. The longitudinal section of this block C is shown in Fig. 7 on the line Y-Y of Fig. 8 and a cross section of it is shown in Fig. 10 which is on the line X-X of Fig. 7. The block B has radial grooves B B2 Bs B4. These grooves are repeated until the whole block is divided into sections and l 'sAsH-CENTEE. f

` specification of Letters Patent; Patlild Api. 1, 1919. Application filed January 13, 1919. Seria1No.270,831; 1 i

grooves `as shown in Fig. 2. The block C is `peculiarly shaped and fits into a mortise for recess in the block A, the mortise or recess' being lettered C3 C3 Fig. 3, in which the face of the block appears. The central portion of the block is hollow as shown at C Fig. 7 and is raised from the surface forming a cup shaped part which encircles a spiral spring S. A holding bolt D is inserted inside of the spiral spring and pressed through a recess E (see Figs. 2 and 7) in the block B. A head D is preferably formed on the end of the bolt D and a washer D2 as shown in Fig. 6, is passed underneath the head D', and the tension of the spring holds the parts together. On the block C and in the cavities C2 C2 when it is passed into or through the block A are inserted friction rollers F like that shown in Fig. 9. The block C being elastically held in position for the spring S holds the rollers in place with frictional tension against the block B and as the sash centers are turned one upon the other, the roller passes over the elevations in the block B and falls into the grooves B2 B3 etc., according to the amount of turning. The tension' of the springy holds the parts in any position in which it may be placed until the application of force places the sash centers in a different position.

The block C is narrower than the diameter of the roller and the mortise or orifice C8 in block A, as shown in Fig. l0, is enlarged toward the junction of the two blocks, the friction roller is larger than the mortise or orifice C3, as shown in cross section in Fig.

10. The elasticity of the spring S allows the block C to oscillate to some extent as the friction rollers pass over the ridges between the concavities B1 B2, etc., and therefore avoid the necessity of a perfectly accurate construction as well as avoiding binding as would probably be the case if there was no variation allowed.

To assemble this the block C must be placed in the block A from the rear side toward the jamb, the rollers inserted from the face side as they will not go through the mortise or cavity C3. The block B is then placed over the rollers with any one of the grooves BL B2 etc., the block connecting with the friction rollers. The spring S is then placed in the pocket C',

the bolt D is placed through the Whole and compressed until the Washer D2 can be arranged around its neck at D1.

Its operation may be fullyv understood from the foregoing description.

What I desire to claim is:

In a sash center the combination olfy a block adapted to be Xed in position to the janib, a secondary block adapted to be fixed in position' to the sash, one of said blocks having a longitudinal perforation a. third block adapted to be held in position by a spiral spring and a bolt, said spring and bolt, said third block projecting into the perforations in one of ,said first mentioned blocka friction rollers iinpinging against said third block oi adiarneter larger than the perforations in said block, means for holding said bolt and spring and the three blocks in position when assembled, substantially as described. l

In testimony whereof, I sign thisspeciioation. c

` CHARLES V. HETTS.

`l Copesmof this patent may be obtained for ve cents each, by addressing the; Commissioner Qfvqlatevnts,

i Washington, 1).` C. 

